According to AAMC (the MCAT test maker), there are 1 MCAT test centers in Thailand. Most testing centers are located inside a college or university. You can select a testing location that is nearest to you. Please note that you are able to choose a test center when registering for the MCAT.
BANGKOK MANEEYA CENTER #1, THAILAND
INSTITUTE OF INTERNATIONAL EDUCATION
6TH FLOOR MANEEYA CENTER NORTH
518/3 PLOENCHIT RD, PATHUMWAN
BANGKOK, Thailand 10330