Queensland man Omar Succarieh has been sentenced to four-and-a-half years' jail for foreign incursion offences for helping Australian fighters in Syria in 2014.

Succarieh, 33, a former Islamic bookshop owner in Logan, south of Brisbane, was due to stand trial on terrorism-related charges in the Supreme Court in Brisbane last month but pleaded guilty to four foreign incursion offences after the Commonwealth Director of Public Prosecutions (DPP) dropped two more serious charges.

Succarieh's sentencing hearing, which began yesterday, was told that between January and July 2014 he provided about $US43,700 to his brother, Abraham Succarieh, to be shared with three other Australians to engage in armed hostilities in Syria.

The court also heard Succarieh helped make travel arrangements for another man heading to the conflict zone by obtaining $7,700 in funds and making a series of calls to his brother using a phone subscribed to under a false name.

A supporter of Omar Succarieh leaves the Supreme Court in Brisbane. ( ABC News: Josh Bavas )

In sentencing, Justice Roslyn Atkinson said Succarieh felt he had a religious duty to fight those who oppress Muslims, and had "vicariously participated" in the Syrian conflict.

"At the time of your offending, your religious beliefs were fundamentalist in nature," she said.

She said Succarieh's actions had damaged social cohesion and potentially made sections of the community fearful of Muslims.

"Your family has certainly been harmed, but the Muslim community is harmed by your offences because of the fear of them that it might engender in people thinking that you represent the Muslim community, which you most certainly don't," she said.

"It does harm to the Australian community as a whole and certainly damaged the social cohesion of our community which is a tolerant, multicultural community."

AFP warned Succarieh about supporting Australians in Syria

She said Succarieh knew he was committing offences because he had been warned by the Australian Federal Police about supporting Australians in Syria after they found out his two brothers were there.

"The evidence demonstrates that you were aware of the likelihood that you were under surveillance by federal authorities and that your usual telephone may be monitored," she said.

"You therefore conducted your conversations with Abraham using a covert telephone."

But she accepted there was no evidence he had plans to support terrorist activity in Australia.

Justice Atkinson took into account the 90 days Succarieh had spent in solitary confinement.

With time already served, Succarieh will be eligible for parole in less than a year.

Succarieh gave a thumbs up to his supporters as he was led away from the dock after his sentencing.

At least 10 of his supporters were in court for the hearing, and at one stage, Justice Atkinson told them to sit apart so they were not in a large group.

None of them spoke to waiting media as they left the court precinct.