On 24 January 2022, it was revealed that Simpkins had allegedly been involved in a car accident in which he mounted the kerb and drove through a fence while also being unlicensed. Simpkins then allegedly fled the scene of the accident but later handed himself into NSW Police. The Wests Tigers club later released a statement saying "Wests Tigers have been made aware of an incident involving NRL player Tukimihia Simpkins, the club has alerted the NRL to the matter and will continue to work with the NRL Integrity Unit as needed".
