Starting from March 22nd, you are requested to have an health certificate about the covid and to be insured of at least 100.000$ to enter in Thailand, no matter from which country you are coming and your recent history travels
TLDR : Answer Summary
Starting March 22nd, travelers entering Thailand are required to present a health certificate concerning COVID-19 and proof of insurance coverage of at least $100,000, regardless of their country of origin or recent travel history.