Evarn Tuimavave will join Hull KR at the end of the season on a two-year deal.
The forward is currently playing for Newcastle Knights in the NRL, having made his debut Down Under with New Zealand Warriors in 2002.
He played 105 games for the Warriors before joining the Knights in 2010 but, in his first year with his new club, suffered a ruptured Achilles tendon.
Tuimavave told the Newcastle Knights website: "I would like to thank all the fans for sticking by me after my Achilles injury in 2010.
"I am looking forward to a new chapter in my life over in England and I thank everyone at the Knights for my time here."