The Western Provincial Assembly elected Biyama on Monday to take up the seat.
The seat for the Governor was left vacant after the court found that then Governor Ati Wobiro was found guilty of misappropriation of funds by the court.
The National Court sentenced Wobiro along with former Western Provincial Administrator Dr Modowa Gumoi, and Fly Care Foundation Inc. boss Norman Carl May to 10 years in prison on Nov 18, 2016.
The North Fly MP Boka Kondra was also suspended by the Leadership Tribunal awaiting his court hearing.