Sale have signed Lionel Faure from Pau and Neath-Swansea Ospreys duo Elvis Seveali'i and Nathan Bonner-Evans, all on two-year contracts.
Prop Faure, 27, could play against Sale in the European Challenge Cup Final on 21 May.
Samoan international Seveali'i, who is 26 and has had Zurich Premiership experience with Bath, can play either in the centre or on the wing.
Welshman Bonner-Evans, also 26, plays at number eight.