Joined Farnborough on an initial one-month loan from Sky Bet League Town Swindon Town in January 2025.
Centre-back Sonny signed for The Robins from Southend United in 2021 and went on to make his First Team debut the following year in the EFL Trophy against Crystal Palace U21.
He was also a mainstay in the young Swindon Town defence that reached The FA Youth Cup Quarter-Finals, as well as going eight League games unbeaten, before he signed his first professional deal with the Club in July 2024.
The 18-year-old already has some Non-League experience to his name, having spent time on loan at Harrow Borough, Gloucester City and most recently Canvey Island.
So far this season, Hart has made 22 appearances for The Gulls in all competitions, helping them to 11 wins; including netting in a 2-1 Isuzu FA Trophy win at Maldon & Tiptree.