"This is a highly impressive performance as I believe our team is still developing under (coach) Russell Domingo and (captain) AB de Villiers in this World Cup year," said CSA Chief Executive, Haroon Lorgat.
"The home series win over world champions India last season and now beating a top team like Sri Lanka in their home conditions is significant progress. It is a huge improvement from last year's series defeat in Sri Lanka when we were simply outplayed. It shows just how much the Proteas have advanced.
Lorgat said the team could now look forward to regaining the No. 1 Test ranking.
"The team again showed its character in today's victory by the manner in which it fought back to dismiss Sri Lanka's three senior statesmen after they had made such a runaway start," Lorgat said.