Taumalolo was contracted to the Guinness Premiership outfit until 2009 but requested early release in order to spend more time with his Tonga-based family.
"I've played in Britain for a long, long time and I need to go for a change," said the 31-year-old.
"I would love to stay at Bristol but my family is now more important to me."
Taumalolo made 19 starts last season but has since found opportunities limited by the emergence of Luke Arscott as first choice full-back.
