The announcement bolsters an order last month blocking boats from mooring on Maya Bay in a bid to prevent further damage to its coral reefs.
Up to 4,000 tourists and hundreds of boats have been flocking daily to the white-sand beach on Ko Phi Phi Ley, an island whose towering limestone cliffs and azure waters were made famous by the film starring Leonardo DiCaprio.
But the bay will now be off-limits to travellers for four months during Thailand’s monsoon season, said National Park Office Director Songtham Suksawang.
“We reached a resolution to close Maya for four months to allow the ecological system to rehabilitate,” he said.
The beach’s land entrance will be shuttered while boats will be barred from dropping off passengers, he added.
During the shutdown, four universities will conduct a study on how to develop more sustainable forms of tourism, he said.
The closure is the latest effort to mitigate the environmental damage wrought by Thailand’s mammoth tourism industry, a crucial pillar of the economy that brought a record 35 million travellers to the kingdom last year.
Environmental experts and officials have warned that mass tourism is causing irreversible damage to beautiful beaches, with garbage and unchecked development disrupting local ecosystems.
Smoking has already been banned on 20 of the country’s beaches with a fine or even jail for those who flout the new rule.