Series organiser GTA revealed a heavily-revised calendar last week with seven of the eight rounds taking place at one of just three tracks: Fuji, Suzuka and Motegi.
However, tentative plans were made to round off the coronavirus-delayed campaign in Thailand in late December, should international travel become possible by then, with Fuji on standby to hold a fourth race should this prove impossible.
On Monday, the GTA issued an update stating that, after consulting the local promoter in Thailand, it had been decided it will not be possible to travel to Buriram after all.
It means Buriram joins Sugo, Autopolis, Okayama and Sepang as the fifth venue to drop off the original 2020 SUPER GT calendar.
Fuji has now been confirmed as the host of the final round of the year on November 28-29.
The first four rounds of the revised schedule will all be held with no spectators, meaning the earliest fans could be able to attend would be October's third Fuji race.
Revised 2020 SUPER GT calendar:
|July 18-19||Fuji Speedway*|
|August 8-9||Fuji Speedway*|
|September 12-13||Twin Ring Motegi*|
|October 24-25||Suzuka Circuit|
|November 7-8||Twin Ring Motegi|
*Races with no spectators