In 1996 Ó Sé was in his final year as a member of the Kerry under-21 team. A second Munster winners' medal was secured after an absolute trouncing of Clare in the provincial decider. The 3–14 to 0–6 victory put Kerry on the All-Ireland trail once again. Cavan provided the opposition in the subsequent All-Ireland decider, however, that game was far from a rout. Kerry had the upper hand for much of the game and went on to win by 1–17 to 2–10. It was Ó Sé's second All-Ireland winners' medal in the under-21 grade.