Wallace made his debut for Scotland in a List A match against Hampshire at the Rose Bowl in the 2011 Clydesdale Bank 40.
[4] In July 2019, he was selected to play for the Edinburgh Rocks in the inaugural edition of the Euro T20 Slam cricket tournament.
[7] In September 2019, he was named in Scotland's squad for the 2019 ICC T20 World Cup Qualifier tournament in the United Arab Emirates.
[8] In September 2021, Wallace was named in Scotland's provisional squad for the 2021 ICC Men's T20 World Cup.
[9] Having already been Scotland Women's interim head coach for a year, Wallace was appointed to the role permanently in August 2024.