[3][4] In June 2022, while playing in the Jersey Flegg Cup for the Dragons, Couchman was selected to represent New South Wales in the Under 19's State of Origin match against Queensland.
[1] In round 2 of the 2023 NRL season, Couchman made his first grade debut for the St. George Illawarra Dragons in place of the injured Jack de Belin in his side's 32−18 victory over the Gold Coast Titans at Jubilee Oval.
[6][7] Couchman would play a total of 15 games for the club in the 2023 NRL season as they finished 16th on the table.
[8] Couchman played eleven matches for St. George Illawarra in the 2024 NRL season as the club finished 11th on the table.
[9] On 13 November the Dragons announced that the Couchman brothers had re-signed with the club on a three year deal.