Voisin began karting in France in 2016, competing in the Rhône-Alps regional series for two seasons before transferring his licence to the United Kingdom. In 2019 he won the English Minimax Championship and represented Team UK at the Rotax World Finals in Italy. In 2020, racing in Rotax Junior Max, he led the British Championship for much of the season and finished third, again representing Team UK at the Rotax World Finals. He also competed in the Belgium National League and European Rotax Winter Championships.
In 2021, Voisin moved to car racing with Championship-winning team R Racing in the Ginetta Junior Championship. He recorded seven outright victories — joint highest for the season — along with nine rookie victories, eleven outright podiums, and finished sixth overall.
Voisin joined Carlin for the 2022 GB3 Championship, where he won his first single-seater race at Donington Park in Race 1. He added further victories at Snetterton and Donington Park at the season finale, and won the Jack Cavill Pole Position Cup for accumulating the most pole positions during the campaign. He finished fourth in the championship. At Spa-Francorchamps that year, a red flag regulation cost him a victory that was transferred to Tommy Smith.
Remaining with the team — renamed Rodin Carlin for 2023 — Voisin won the GB3 Championship title and the Jack Cavill Pole Position Cup for a second consecutive year. He was a finalist for the Aston Martin Autosport BRDC Young Driver Award in both 2022 and 2023, reaching the four-driver shootout in 2023 alongside Joseph Loake, Arvid Lindblad, and Taylor Barnard.
Voisin made a one-off return to GB3 in 2024 for the season finale at Brands Hatch with Rodin Motorsport.
Promoted to FIA Formula 3 for 2024, Voisin remained with the team now operating as Rodin Motorsport. At Silverstone, he was set to win the feature race but a ten-second time penalty demoted him to third, with Arvid Lindblad inheriting the win. Voisin then delivered a grand slam at Spa-Francorchamps: he took pole position, led every lap, set the fastest lap, and won the race — marking Rodin's first win in the FIA Formula 3 Championship. He finished the 2024 season twelfth in the standings with 67 points.
Voisin continued with Rodin Motorsport for 2025, partnering Roman Biliński and fellow GB3 champion Louis Sharp. After a difficult Melbourne opener that included a retirement following an incident with Nikola Tsolov, he bounced back with a second-place finish in the Bahrain feature race, placing him third in the standings at that stage.
In July 2025, Voisin tested a Formula E car for the first time at the Tempelhof Airport Street Circuit in Berlin, driving for Cupra Kiro alongside Bianca Bustamante and finishing fourth in the afternoon session. In March 2026 he drove for Andretti during the Madrid ePrix rookie test.
Voisin competed in the 2025–26 Asian Le Mans Series for High Class Racing. In October 2025 he was selected as one of the finalists for the Porsche Carrera Cup Great Britain junior programme. He was confirmed as the RAFA Racing Club Porsche Carrera Cup GB Junior for 2026 and 2027, competing for Century Motorsport in the Porsche Carrera Cup GB and for Ombra Racing in the Porsche Carrera Cup Italia.
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