The 23-year-old has agreed a two-year deal and will move from the New South Wales Waratahs in the summer.
He is a centre like Sione and both qualify for Scotland thanks to a granny from Greenock.
But Mosese wants to make his mark at club level before he even contemplates claiming a cap.
He said: "I'm really excited to make the move to Edinburgh. I'm itching to get over and experience something different to what I've grown up with.
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