Regulation under Section 9 of the Emergency Decree on Public Administration in Emergency Situations B.E. 2548 (2005) (No.1) (Effective from 26 March 2020)
Clause 3 Closure of Point of Entry into the Kingdom
In using vehicles, whether aircrafts, vessel, motor vehicles or any other types of conveyance, or using transportation routes, whether by air, water, or land in order to enter into the Kingdom, the responsible officials shall close the Points of Entry, checkpoints, border crossings or border checkpoints for passengers or travelers entering into the Kingdom, in accordance with the laws on communicable disease and immigration, except for:
(1) The case, or an exempted person, as prescribed or permitted to pertaining to necessity by the Prime Minister or Chief Official responsible for remedying the emergency situation whereby conditions and timeframes may also be prescribed;
(2) Carrier of goods pertaining to necessity, who shall promptly depart after completing their mission;
(3) Vehicle operators and crew members of vehicles, who need to enter into the Kingdom pursuant to their mission, with a clear scheduled time of departure;
(4) Persons on diplomatic or consular missions or under international organisations, or representatives of the government performing their duties in Thailand, or other persons or international agencies, including their families, that the Ministry of Foreign Affairs gives permission to pertaining necessity, shall apply for a certificate of entry into the Kingdom from the Ministry of Foreign Affairs with relevant documents, and shall also comply with paragraph two;
(5) Non-Thai nationals who have work permit or have been granted permission from government agencies to work in the Kingdom, and shall also comply with paragraph two;
(6) Thai nationals who shall apply for a certificate of entry into the Kingdom from the Royal Thai Embassy or the Royal Thai Consulate in their country of residence, or has a medical certificate, and shall comply with paragraph two; The Royal Thai Embassy and Royal Thai Consulate abroad shall provide information and facilitate Thai nationals returning to the Kingdom.
Persons granted an exemption or relaxation under (4) (5) or (6) must have a Fit to Fly Health Certificate which has been certified or issued no more than 72 hours before travelling; upon entry into the Kingdom, they must also comply with disease prevention measures prescribed by the Government under Clause 11, mutatis mutandis;
Immigration officers have the power, in accordance with immigration laws, to refuse entry into the Kingdom of non-Thai nationals who have been tested positive for COVID-19 or are under suspicion of being infected or who refuse to undergo such test.