Inthraphuvasak made his car racing debut in January 2021, competing in the 2021 Formula 4 UAE Championship with Xcel Motorsport.

[4][5] He was disqualified from race 3 at the opening round at Thruxton Circuit after failing to comply to a black and orange flag.

[6] Throughout the rest of the season, he finished on the podium three times, including a win during the reverse-grid race at the final round at Brands Hatch.

In late 2022, in preparation for a full Formula Regional campaign the following year, Inthraphuvasak paired up with Graff to take part in two rounds of the Ultimate Cup Series' single-seater category.

The Thai starred on debut, taking pole and winning lights to flag in his first race at the Hockenheimring.

[17] Inthraphuvasak was revealed as one of the drivers for Pinnacle VAR in the 2023 Formula Regional Middle East Championship.

In 2024, he was announced to be returning to the Formula Regional Middle East Championship for the 2024 season, driving for PHM AIX Racing.