Another Wallaby passed on to new Super side
"Kepu has played 295 professional matches since his debut in 2006 and brings with him a wealth of knowledge to impart on our exciting, young squad," the club announced on social media.
Moana Pasifika has been set up to give a professional pathway for players from island nations such as Samoa and Tonga.
The revamped Super Rugby competition next year includes the Pasifika team, fellow rookies Fiji Drua, as well as five sides apiece from Australia and New Zealand.
It is scheduled to kick off on February 18.