Tasmania will not open its borders to any other jurisdiction before August 31.
Premier Peter Gutwein said given the uncertainty around the situation with coronavirus in Victoria, the state's borders would not reopen to South Australia, the Northern Territory and Western Australia as planned on Friday.
"Nor will we reopen to other parts of the country on August 14," he said.
"The next six weeks in Victoria will be critical for the country.
"Now is the time we utilise our best asset, and that is our moat."
Mr Gutwein said no exemptions would be made for the AFL.
"No AFL games will be played in Tasmania in August," he said.
Tasmania remains coronavirus free.
More than 70,000 tests have conducted, with 800 people tested on Sunday.