[13] Sweetnam was named Man-of-the-Match in Munster's 2018–19 Pro14 opening win against South African side Cheetahs on 1 September 2018, scoring one try in the provinces 38–0 victory.

[16] Sweetnam joined French Top 14 club La Rochelle, where former Munster player Ronan O'Gara is head coach, as a medical joker on a three-month deal to provide backs cover after an injury to Jérémy Sinzelle in March 2021.

[16] He made his debut for the club in their 38–23 win against Lyon on 17 April 2021, coming on as a replacement for fullback Brice Dulin in the 60th minute.

[17] Sweetnam was not kept on by La Rochelle, but joined another French club, Pro D2 side Oyonnax, ahead of the 2021–22 season.

[18] Sweetnam was named in the Ireland Under-20 team for their 2013 Under-20 Six Nations Championship opener against Wales on 1 February 2013[19] and made his debut as a replacement during the game.

[22] Sweetnam started for Ireland Under-20s in their 5th–6th place play-off against hosts France Under-20s on 18 June 2013, a game which the French team won 9–8.