The pair admitted to the act and were charged under public indecency laws, the government statement said.
Public nudity and sexual acts in public are punishable by a fine up to 5000 baht ($155).
The clampdown was “intended to safeguard Thailand’s beautiful cultural values”, according to the Prime Minister’s office.
Checks by authorities of entertainment venues would also be stricter, it added.
Despite its reputation as a sex tourism destination, Thailand is a mostly socially conservative society where public displays of affection are frowned upon.
But the country also decriminalised cannabis in 2022 and is popular among backpackers and young tourists for its rowdy beach raves.
Last month, a French couple was arrested and deported after footage of them having sex on a Phuket beach spread widely online, according to local media.
Another couple from France was blacklisted and had their visa revoked after a video of the pair having sex in a tuk-tuk in Phuket earlier this year triggered outrage online.
Thailand expects about 33.5 million foreign tourists this year, up from nearly 33 million visitors in 2025, the Government has said.
Total tourist arrivals dropped 7% in April compared to the same month last year, with visitors from Europe declining nearly 16% that month, according to Tourism Ministry figures.
– AFP