Lukas Enembe travelled to Port Moresby to attend celebrations to mark PNG's 43rd anniversary of independence.
Mr Enembe, who was recently re-elected as governor of Indonesia's eastern-most province, led a delegation of 21 people to Port Moresby.
He was invited by the governor of PNG's National Capital District, Powes Parkop.
Mr Parkop has this month spoken out about human rights abuses in Indonesia's Papua region, widely known as West Papua.
He was critical of both PNG and Indonesian governments for not confronting the West Papuan rights issue openly.