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The 27-year-old former Waratahs player has signed a two-year deal and will join from Toulouse, where he has spent the last three seasons.
French prop Stephane Clement, 30, will also join from Lyon on a three-year deal at the end of the season, Stade said.
The 2015 French champions Stade are currently in a lowly 11th place in the Top 14.
They are away to London Irish in the European Challenge Cup on Saturday but having lost two of their opening Pool 4 matches face an uphill battle to defend the title they won last season.