The Civil Aviation Authority of Thailand has issued a notification on conditions for international flights to Thailand. The notification will be in effect from 1 July onward. Here are the types of flights and passengers that are allowed to enter at international airports in Thailand, once permission is given by CAAT. Aircraft and passengers entering the Kingdom must comply with the conditions, time limits, and rules for controlling the disease.
Non-Thai nationals are allowed to enter Thailand, but under restrictions, so those who wish to apply to enter Thailand should contact the Thai embassy or consulate in their country for more details.
Source: The Civil Aviation Authority of Thailand & PR Thai Government