Ó Beaglaoich first played Gaelic football to a high standard as a schoolboy at Pobalscoil Chorca Dhuibhne.
He was part of the school team that won back-to-back Hogan Cup titles in 2014 and 2015, with Ó Beaglaoich lining out as joint-captain for the latter victory.
[3] By that stage, Ó Beaglaoich had also progressed to adult level with the An Ghaeltacht club, having earlier enjoyed success in the under-21 grade.
[8] Ó Beaglaoich was at left wing-back when Kerry were beaten by Dublin in the 2019 All-Ireland final replay.
Ó Beaglaoich won an All-Ireland SFC medal after a defeat of Galway in the 2022 final.