The 26-year-old flew into Manchester yesterday to link up with the Sharks and has agreed a three year deal with the club, having agreed to move to the AJ Bell Stadium from New Zealand provincial side North Harbour.
Sale director of rugby Steve Diamond had been tracking the number eight since the summer.
And having finally got his man on board, he expressed his delight at the latest addition to the Sharks ranks.
"Vilaimi's a really good ball carrier and we're delighted that he has agreed to join us," said Steve.
"He could have delayed coming here and gone with Tonga on their current Autumn tour of Europe but instead he's opted not to go and he has joined up with us straight away which is a great boost for us.
"He's signed with us for three years and we will be looking to get him involved straight away here.
"We had been looking for another back row player all summer and we identified Viliami playing over in New Zealand for North Harbour in the ITM Cup and he comes highly-recommended from our contacts over there.
"And we believe that Viliami will be a really good addition to our ranks and that he will add something extra to the squad."
Viliami in action http://www.youtube.com/watch?v=woA6EgPKLcY
Sale Sharks next home game is on Friday 22nd November against Worcester Warriors, kick off 7-45pm. Tickets for the game and Half Season Tickets can be purchased by phoning 08444-994-994. You can also request a callback by emailing email@example.com