UPDATED NOVEMBER 23, 2021:

If you are unvaccinated:

Alternative Quarantine Program

For international travelers who are unvaccinated or not fully vaccinated, they will be required to undergo the mandatory alternative quarantine of 10 days in a designated quarantine hotel in Bangkok, Phuket, or Samui before they can travel to other parts of Thailand.

Some of the smaller boutique hotels have had some issues upon arrival, so we recommend booking with Marriott’s three approved quarantine hotels upon arrival:  https://hotel-deals.marriott.com/alternative-state-quarantine-packages-bangkok/

If you are vaccinated:

Thailand Pass Program

Fully vaccinated travelers from the listed Low-Risk Countries are allowed to enter Thailand without quarantine. Here are the requirements: Fully vaccinated for more than 14 days before traveling; Residing in the country of departure for at least 21 days; Must book a SHA+ Hotel for at least one night while waiting for the result of the RT PCR COVID test taken upon arrival; must possess a COVID-19 Insurance.

Full Thailand Pass info: