Sainsbury has played 90 minutes in 18 of Jiangsu's 19 league matches so far this season, but it was the first time the Socceroos centre-back has scored.
Colombian Roger Martinez produced a man of the match performance with two goals in 60 minutes, while Xi Wu also got on the scoresheet for the hosts.
Jiangsu Suning maintained second position on the Chinese Super League ladder, 10 points behind Guangzhou Evergrande.
