Junior Niagara IceDogs Tomasino was drafted by the
Niagara IceDogs of the
Ontario Hockey League in the first round, fifth overall, at the 2017 OHL Priority Draft. He had previously played minor midget hockey for the Mississauga Rebels. Tomasino played in his first game with the IceDogs on September 23, 2017, earning an assist in a 4–1 victory over the
Hamilton Bulldogs. On October 19, Tomasino scored his first career OHL goal, as he scored against
Jacob Ingham of the
Mississauga Steelheads in a 6–3 win. In 61 games during the
2017–18 season, Tomasino scored five goals and 24 points. On March 2, 2018, Tomasino was named Central Division Academic Player of the Month for February Tomasino saw his offensive production increase in his second season with the IceDogs in
2018–19. On September 29, Tomasino earned four assists in a 6–1 win over the
North Bay Battalion. Tomasino recorded the first multi-goal game of his OHL career on November 17, scoring twice in a 6–3 victory over the
Erie Otters. Tomasino set a career high for points in a game, as on December 15, he scored two goals and added three assists in a 6–2 win over the
Oshawa Generals. In 67 games with the IceDogs, Tomasino scored 34 goals and 72 points. On March 26, Tomasino earned his first career OHL playoff goal, as he scored twice against
Christian Propp of the Battalion, and added an assist in a 6–0 win. In 11 postseason games, Tomasino scored four goals and seven points. Tomasino returned to the IceDogs for the
2019–20 season, as he was named an
assistant captain. On October 4, Tomasino scored his first career OHL
hat-trick, as he scored three goals, and added three assists, for his first career six point game, in an 8–4 win over the
Kingston Frontenacs. On January 2, Tomasino scored a goal and added four assists in a 9–8 overtime victory over the
North Bay Battalion. On January 9, the IceDogs traded Tomasino to the
Oshawa Generals for
David Guicciradi, a 2nd-round selection in 2020, a 2nd-round selection in 2021, 3 2nd-round selections in 2023, 1 2nd-round selection in 2024, a 3rd-round selection in 2024, and a 4th-round selection in 2020 and 2024. In 36 games with the IceDogs, Tomasino scored 22 goals and 57 points.
Oshawa Generals Tomasino finished the
2019–20 season with the
Oshawa Generals following a mid-season trade with the
Niagara IceDogs. Tomasino played his first game with the Generals on January 9, as he scored two goals and added three assists for a five-point game in a 6–3 win over the
Windsor Spitfires. Tomasino's first goal with the Generals was against
Xavier Medina. On January 25, Tomasino recorded his second five-point game with Oshawa, as he scored a goal and added four assists in a 7–4 win over the
Kingston Frontenacs. In 26 games with Oshawa, Tomasino scored 18 goals and 43 points. Overall, between the
Niagara IceDogs and his time with Oshawa, Tomasino scored 40 goals and 100 points in 62 games, as he ranked fourth in OHL scoring during the regular season.
Professional Nashville Predators Tomasino was drafted by the
Nashville Predators in the first round, 24th overall, at the
2019 NHL entry draft, held at
Rogers Arena in
Vancouver, British Columbia. Tomasino was signed by the Predators to a three-year, entry-level contract on October 21, 2019.
Pittsburgh Penguins During the
2024–25 season, on November 25, 2024, Tomasino was traded by the Predators to the
Pittsburgh Penguins in exchange for a fourth-round pick in the 2027 NHL entry draft. He made his Penguins debut on November 27 in a game against the
Vancouver Canucks. He scored his first goal as a Penguin in his second game against the
Boston Bruins.
Philadelphia Flyers On December 31, 2025, the
Philadelphia Flyers acquired forward Philip Tomasino from the
Pittsburgh Penguins in exchange for defenseman
Egor Zamula. Following the trade, Tomasino was expected to report to the Flyers’ AHL affiliate, the
Lehigh Valley Phantoms. ==Personal life==