Moga made his NRL debut in 2012, playing for the Sydney Roosters before linking with the North Queensland Cowboys in 2014 and the Brisbane Broncos in 2017.
The 23-year-old has played 49 NRL matches.
“We are looking forward to welcoming Tautau to the Knights next season,” CEO Matt Gidley said.
“Tautau is an athletic and exciting outside back and he will be a great addition to our squad.”
Moga joins Kalyn Ponga and Aidan Guerra at the Club in 2018, while Shaun Kenny-Dowall has arrived at the Club mid-season.
“We continue to build our squad for next season and beyond and plan to have further announcements over the coming weeks,” Gidley concluded.
This was first published on the Newcastle Knights website