A Victorian grandfather arrested for training as a mercenary to fight the Indonesian government has been ridiculed in a Brisbane court as a delusional man who posed no threat to anyone but himself.

Gerard Michael Little, 46, was sentenced on Thursday after pleading guilty to training for incursions into foreign states for the purpose of engaging in hostile activities.

Gerard Michael Little. Photo: Supplied Credit:Chad Van Estrop

District Court Judge Douglas McGill did not impose a jail sentence above the seven months and six days Little has already served since his arrest in December last year.

The court heard Little took a five-day "counter-terrorism" training course in the Ukraine in August 2012 and planned to travel to West Papua to join the West Papua independence movement.