Hoskins, 23, has represented Australia at Under-20 level and made 26 Super Rugby appearances for the Force.
"I'm really excited at the prospect of joining London Irish," he said. "It's clear the club is genuinely building for the future."
Hoskins made his debut for the Perth-based Super Rugby franchise in 2014, playing 15 times in his first season.
Australian prop Oliver Hoskins will join London Irish next season from Western Force on a two-year deal.