The dual-code international said: “I will never forget Leicester’s warm hospitality.
“But the opportunity to play under the most experienced coach in the game, Tim Sheens, at Wests was a major factor.”
The Fijian-born star, who had his contract with the Australian rugby union cancelled in July, is likely to play at full-back for Wests.
He added: “There was plenty of speculation about my next career move.
“I enjoyed my time in rugby union immensely but Wests Tigers is a club with a great culture and a terrific roster of players. I am thrilled to be joining them.”