PM orders 152 Thais who landed at Suvarnabhumi on Friday afternoon and refused to enter state quarantine to report themselves before 6pm Saturday, or face legal action.
Police and soldiers wearing protective masks set up hundreds of checkpoints across the country on Friday night to enforce an indefinite nationwide curfew.
Plans unveiled for a fresh government stimulus to bolster the ailing economy, with the package expected to get cabinet approval on Tuesday.
Global coronavirus infections surpassed 1 million, a milestone reached just four months after the first cases surfaced in China. More than 53,000 people have died around the world.
The number of confirmed coronavirus cases around the world soars past one million and deaths top 50,000 as the US reports the highest daily death toll of any country so far.
The Thai economy would shrink by 5% this year in the World Bank's worst-case scenario, with the coronavirus outbreak compounding existing problems.
Tokyo confirmed 97 new cases, marking the biggest single-day increase. Philippine President Rodrigo Duterte gave authorities shoot-to-kill green light when dealing with protesters attempting to riot or disrupt food distribution.