The 23-year-old former Huddersfield Giants rugby league player will head to Edgeley Park this summer.
"Luther is an excellent signing for us. He is a big, powerful centre who can defend well and can also break holes in the opposition defence," said Steve Diamond, Sale's executive director of sport.
"He was a stand-out player for Leeds when they played against us at Edgeley Park recently, and I am sure he will fit in well with what we are trying to create."
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