Born in Toronto, Ontario, Ashman started playing rugby at Sandbach RUFC.
He made his senior debut for the Cheshire’s club in Midlands Premier during the 2017–18 season,[2] also joining Sale Sharks academy in 2017.
[4][5] During the next season he was first loaned to Edinburgh as players had left for the World Cup, but never managed to make his professional debut, being blocked by Dave Cherry, Cammy Fenton and Mike Willemse,[1][3] eventually ending up playing in National League 1 with Sale FC.
[1][3][9][10] During the winter, he also took part in the 2020 U20 Six Nations,[11] starting all of Scotland five games, and becoming the top try scorer as his team ended second in this unfinished edition standings.
[15] He earned his first cap and scored his first international try on 7 November 2021 at Murrayfield in a closely won victory over Australia after coming on as an early substitute for George Turner.