7 Jun, 15:39
The 29-year-old has made five European appearances for the former Heineken Cup Champions this season and helped his side through to the semi-finals of the Amlin Challenge Cup with victory in Brive on Saturday.
Tuitupou lifted the Under 21's World Cup with New Zealand and went onto win nine senior International Caps.
"Sam is a great signing for us. He has a great workrate, is very strong in the contact area and will boost our back line in both attack and defence," said Sale's executive director of sport, Steve Diamond.