Andrew Chan and Myuran Sukumaran, the ringleaders of the so-called "Bali Nine" drug trafficking gang, will be flown on a military aircraft, with a second plane escorting them, said Momock Bambang Samiarso, head of the Bali prosecutor's office.
Officials are yet to announce a date for their executions, but the transfer indicates it is imminent. Their lawyers said that pushing ahead with the transfer and executions would amount to a "miscarriage of justice" as legal challenges are still ongoing.
They recently lost their appeals for presidential clemency, typically a death row convict's last chance to avoid the firing squad, and their looming executions have strained ties with Australia, a neighbour and key ally.
They are among a group of 10 drug convicts expected to face a firing squad in the upcoming batch of executions.
More From This Section
Officials have not confirmed the nationalities of the others, although convicts from France, Brazil and the Philippines are among those who recently lost their appeals for presidential clemency.
Following a meeting of officials today, Samiarso told reporters that "the coordination has been completed" and the Australians will be transferred tomorrow.
They are being moved to Nusakambangan island, which is home to several prisons. Five people, including foreigners, were put to death on the island in January, sparking a diplomatic storm.
Attorney-General Muhammad Prasetyo said today that execution preparations were "95 per cent" complete, and the last stage was gathering all the prisoners on Nusakambangan. Some of them are already on the island.
The Australians' legal team has recently launched several attempts in the courts to save them from the firing squad, and their lawyer Todung Mulya Lubis said that moving forward with the executions would be a "miscarriage of justice".