The New South Welshman exploded onto the international scene when he debuted for Australia alongside fellow Scorcher Jhye Richardson last summer, scoring a century in just his second match wearing the Baggy Green.
Patterson said he couldn’t wait to get stuck into a fresh challenge.
“I am really excited to be heading to the West and joining a successful club,” he said.
“The opportunity to gain different insights from new coaches and playing on the fast wicket at Optus Stadium were both big factors in deciding to sign with the Scorchers.
“I know the club has a great culture and I can’t wait to be a part of the team.”
Scorchers Head Coach Adam Voges said Patterson had plenty of upside in the shorter format.
“We have seen first-hand how talented Kurtis is, he’s scored a lot of runs against us in all formats over the past few seasons,” he said.
“After losing some experience at the top of the order we identified that as an area to bolster.
“Kurtis is a quality player and I believe he will play the Optus Stadium wicket really well with its extra pace and bounce.”
Patterson’s signing leaves just two spots left on the Scorchers roster, with two international players still to be added.
2019-20 Perth Scorchers KFC Big Bash League Squad:
Fawad Ahmed (new)
Aaron Hardie (new)
Nick Hobson (new)
Kurtis Patterson (new)