In his senior year at Cardinal Newman High School, he was voted North Bay League Offensive MVP.

[2] In 2013, Tomasin was played with the USA Rugby Men's Collegiate All-Americans during his freshman year of college.

At 21 years old, Tomasin was the youngest of the 26 U.S. rugby players vying for a place on the U.S. 12-man roster for the 2016 Summer Olympics,[1] but he missed out on national team selection.

Tomasin played some spells at halfback, instead of his usual forward position, due to injuries to scrum-half Madison Hughes and utility back Maka Unufe.

Tomasin was selected to represent the United States at the 2022 Rugby World Cup Sevens in Cape Town.