The 23-year-old is not in custody and she is being arranged to board a flight out of Thailand, the ministry said in a statement.
Nawit Itsaragrisil, the founder of Thailand’s Miss Grand International pageant, who also represents Han Lay, said she has been in the transit area of a Bangkok airport since Wednesday afternoon.
He said that Han Lay was stopped when she arrived because she was the subject of an Interpol notice.
“She doesn’t want to go anywhere else. She wants to live in Thailand,” he told Reuters. “She is waiting for a resolution on how she can stay in Thailand.”
Myanmar has been in crisis since a coup in February last year sparked protests that the military cracked down with lethal force and thousands of arrests.
A spokesman for Myanmar’s ruling Military Council could not be reached for comment. Interpol did not immediately respond to a request for comment on whether Han Lay was the subject of an Interpol notice.
Han Lay was once a contestant in the Miss Grand International contest when a video went viral on social media of her holding back tears on stage while talking about the bloodshed in Myanmar, on a day when more than 140 people protested. were killed.
In an interview with Reuters last year, she said her people “will never give up”.
Han Lay’s Instagram posts say she has spent most of the past year in Thailand. She was returning home on a flight from Vietnam when she was refused entry.
Additional reporting by CNN’s Heather Chen.