Officers at Kamala Police Station were notified yesterday that Anton Tikhomirov, 29, from Moscow, had left the Sunwing Kamala Beach resort that morning, and had not returned.
Mr Tikhomirov checked into the hotel on Jan 3 after arriving on the island under the Phuket Sandbox scheme.
He tested positive for COVID-19 last Saturday (Jan 8) and was to stay in hotel isolation at least three more nights.
Staff at the Sunwing Kamala resort confirmed to The Phuket News that as of late this afternoon Mr Tikhomirov still had not returned to the resort, where his room was a studio with balcony facing the pool.
Police urge people who have seen Mr Tikhomirov to immediately report his whereabouts by calling 098-010-8322 or calling the Kamala Police Station main contact number 076-385310 (24 hours).