The 23-year-old will make the move from Glasgow Warriors where he played in all six of the Scottish side's Heineken Cup games this season and joins a growing list of players arriving at the club following the appointment of Steve Diamond as executive director of sport.
"I am delighted that Richie is joining us. He is part of the current Scotland squad and played very well when he came on in the Calcutta Cup game at the weekend," said Diamond.
"He is a hard working flanker or number 8 and he will fit in very well with my plans for next season and beyond."
For his part, Vernon couldn't disguise his excitement at his summer move across the border.
"Steve Diamond is very clear on the way forward for Sale Sharks and I am delighted to commit myself to the club for the next two seasons," said Vernon.
"Having broken into the Scotland side I see playing in the Aviva Premiership as a challenge that will only improve me as a player."