Sean, who hailed from Castlerahan, was a brilliant underage footballer. With his brother Tony, a future Cavan senior player and selector, he was on the last Breffni minor team to win a provincial title in 1974. Both Bradys lined out in attack. Sean also played with the Meath vocational team during the early 1970s. In 1990 he purchased the popular Finnegans Pub in Ludlow Street, Navan and quickly turned it into a haven for traditional music lovers. Sean played with his native Castlerahan and other amalgamations in Cavan, and on arriving in Navan became involved with the Wolfe Tones club.