People's Republic Of ChinaFrom
Wikipedia
The Type 99, also known as ZTZ-99 and WZ-123, developed from the Type 98G (in turn, a development of the Type 98), is a third generation main battle tank (MBT) fielded by the Chinese People's Liberation Army. It is made to compete with other modern tanks. Although not expected to be acquired in large numbers due to its high cost compared to the more economical Type 96, it is currently the most advanced MBT fielded by China. The website ArmyTechnology.com considers the ZTZ99 MBT to be one of the 12 best tanks in the world, and is a successor to the Type 98 G tank manufactured for the People's Liberation Army.
Modern South Korean Tanks From
Wikipedia:
South Korea uses this tank:

Today the South Korean army has 2,500 tanks in operation, including the K1A1 and K2 Black Panther, which form the backbone of the South Korean army's mechanized armor and infantry forces. A sizable arsenal of many artillery systems, including 1,700 self-propelled K55 and K9 Thunder howitzers and 680 helicopters and UAVs of numerous types, are assembled to provide additional fire, reconnaissance, and logistics support. South Korea's smaller but more advanced artillery force and wide range of airborne reconnaissance platforms are pivotal in the counter-battery suppression of North Korea's over-sized artillery force, which operates more than 13,000 artillery systems deployed in various state of fortification and mobility.
The future replacement for the K1 MBT has been baptized the K2 Black Panther (Korean: 흑표), which will be fitted with a 1,500 hp (1,100 kW) water-cooled Diesel engine, 120 mm/L55 main gun, and coaxial machine guns. The new tank will also feature radar equipment as well as all-bearing laser detection system and reactive armor comparable to the American M1A2 and French Leclerc.
Modern Japan Main Battle Tank (MBT)Source:
Wikipedia
The Type 90 tank - see image above - (90式戦車 Kyū-maru-shiki-sensha?) is the main battle tank (MBT) of the Japan Ground Self-Defense Force (JGSDF) as of 2014. It was designed and built by Mitsubishi Heavy Industries as a replacement for all deployed Type 61 and Type 74 tanks, and entered service in 1990. It is to be superseded by the Type 10 tank. See image below.

The Type 10 (10式戦車 Hitomaru-shiki sensha?) is a 4th generation main battle tank that the Japan Ground Self Defense Force has been equipped with, and boasts significant enhancements in its capability to respond to anti-tank warfare, mobile strikes, special operations force attacks, and other contingencies
Taiwan - Republic of China (Taiwan)From
Wikipedia and
ArmyTechnology.com:
Taiwan's MBT:

From the 1990s onwards, the Republic of China Army launched several upgrade programmes to replace out-dated equipment with cutting edge state of the art advanced weapons, also increasing its emphasis on forces that could be rapidly deployed and were suited for combat in Taiwan's heavily urbanized environment. Orders were placed with the United States for
M60A3 Patton tanks, M109A6 "Paladin" howitzers and AH-1W SuperCobra attack helicopters, as well as updating existing equipment.
Taiwan's Ministry of National Defence (MND) is planning to procure second-hand M1 Abrams main battle tanks (MBTs) from the US to upgrade the country's ageing armoured tank fleet.
From
armyrecognition.com, "There is no formal Defense Security Cooperation Agency (DSCA) request published yet, but Taiwan looks always to acquire 200 used M1A2 main battle tanks from United States".
Finally, from
strategypage.com comes an excellent 2011 article on SB which states:
"So far, ten countries (Austria, Denmark, Sweden, Norway, Finland, Chile, Canada, Australia, Spain and the U.S.) have bought Steel Beast Professional (at $125 a copy) for training their armor vehicle crews. The troops find the vehicle controls, and tactical situations to be realistic, and compelling. The game really gets the pucker factor going, and even before the pro version came along, troops were buying the commercial version and playing it for the professional, and entertainment, value."------------------------------------------------------------------------------------------------------------------------------------------
Frankie Kam: So
my conclusion is this: with the
exception of Taiwan's MA0A3 MBT, none of the other above tanks are modeled in SB. So that explains why most players are from the US and NATO countries. But it doesn't explain why the odd one, two or three players from South East Asia are playing this game. ;-)
Cheers,
Frankie Kam
Malaysia (that's just north of Singapore)