While a student at the
University of the Free State, Joubert made his debut for the in 1986. In 1992 he moved to and continued to represent the union, that later was renamed the Sharks, until 1999. Joubert was first choice fullback for the during the inaugural
Super 12 competition in 1996, helping them reach the
final against the
Auckland Blues. Also, in 1996, he was man of the match against the then , in the Currie Cup final as he scored two tries. Joubert won three Currie Cups:
'92,
'95 &
'96. He played his last competitive rugby match in the
1999 Currie Cup final for the against the
Gauteng Lions, a match which also saw the final appearances of
Gary Teichmann and
Ian McIntosh as captain and coach respectively. It was a sad farewell for three of Natal's favourite sons as the
Lions lifted the cup with a convincing 32–9 victory. ==International career==