The once-capped Ireland international has been forwards coach to De La Salle Palmerston in recent seasons, the club he was attached to for the last three years of his playing career.
He was a popular figure at 'Salmo, coaching the forwards from the first team and J1 squads, while also offering lineout and scrummaging advice to their other junior sides.
Fogarty will take charge of the Old Belvedere forwards for the coming season, linking up with their Kiwi director of rugby Phil Werahiko who oversaw the club's first ever Ulster Bank League Division 1 success.
Andy Dunne will continue as backs coach to the reigning league champions and while new signings are due to be announced on the playing front, 'Belvo have lost some members of their title-winning pack.
Young prop Stewart Maguire has taken up a move to Connacht and influential flanker Jason Risdon has returned home to New Zealand.
In addition, powerhouse number 8 Leo Auva'a will be required by Leinster at various stages of the season.
Old Belvedere's new club President Noel Shannon said that their ambition is 'to build on the league success and kick on to achieve great things next season at all levels in the club.'
"Phil Werahiko is clearly focused on achieving 'back-to-back' title wins in the Ulster Bank League and my utmost efforts will be to help him achieve this. Most of the senior squad will be available again next season," he added.