Gerard Michael Little was granted bail in the Brisbane Magistrates Court on condition he surrender his passport and not leave the country. He pleaded guilty to training in the use of arms or explosives for the practice of military exercises, manoeuvres or evolutions with the intention of committing an offence against the Crimes, Foreign Incursions and Recruitment Act.
Last year, Fairfax Media reported that Little was part of a plot involving a fake British baron, the West Papuan separatist movement and a Ukrainian military training camp.
He was arrested in Brisbane in December as he tried to board a flight to Papua New Guinea, from where he intended to travel to West Papua.
He has been in custody since then.