Alex Hales has signed a one-year deal and will join Chris Morris as the second overseas player with the side.
BBL is set to get underway on December 17.
The all-rounder, who scored over 10,000 runs and took 291 wickets for Australia across formats, will continue to be available for overseas tournaments.
The Renegades emerged victorious in an all-Melbourne finale, which saw them collect their first-ever BBL trophy.
Khawaja, Cummins and Patterson will play this match for the Thunder.
Khawaja, Cummins and Patterson have joined the Thunder squad for this game.
Thunder have left themselves stranded at the fifth position with only one match to go.
It’s time for the Sydney derby as the in-form Sixers take on the Thunder.
The pitch mostly assists the team batting second.
The team that loses will put its knockout chances under threat.