A Sri Lankan university student who was wrongfully detained in Goulburn's Supermax prison over terrorism-related charges has called out Australian authorities for "immature" and "unprofessional" conduct which violated "basic and fundamental human rights".

Mohamed Kamer Nilar Nizamdeen, 25, was arrested in his University of NSW office in August, after a notebook allegedly containing terrorist ideology inspired by Islamic State was found on the eastern suburbs campus.

The notebook contained notes detailing a potential attack that was planned for several months away, which involved iconic Sydney landmarks and plans to kill former prime minister Malcolm Turnbull.

Mr Nizamdeen then spent four weeks in solitary confinement in Goulburn Supermax prison.