The men, aged in their twenties and early thirties and whose passports had been cancelled, included notorious Australian Islamic preacher Musa Cerantonio, who was detained in the Philippines in 2014 and deported for reportedly urging people to join jihad in Iraq and Syria, the Australian Broadcasting Corporation reported.
The men, who were arrested on Tuesday, bought a seven-metre (23-foot) boat and drove it 2,840 kilometres (1,765 miles) from Melbourne north to Queensland state where they planned to set sail to Indonesia, the Australian Federal Police said yesterday.
"The maximum penalty for this offence is life imprisonment."
The Australian Broadcasting Corporation named two of the other men as Shayden Thorne and Kadir Kaya.
The Federal Police said there was no current or impending terrorism threat from the case and that the men were due at a Queensland state court hearing on Monday.
Canberra has been increasingly concerned about its citizens fighting with jihadist organisations such as Islamic State in Iraq and Syria, saying some 110 Australians had left the country to join such groups.
It has passed numerous national security laws including legislation allowing for passports to be cancelled to prevent Australians from leaving the country.
At least six attacks have been foiled on home soil over the past 18 months, but several have taken place, including the terror-linked murder of a Sydney police employee in October.
