They've become the first Asian country to win a Test series in South Africa.
Oshada Fernando and Kusal Mendis hit unbeaten half centuries to help the tourists chase down 197 and win the second Test at Port Elizabeth by eight wickets.
It comes after they successfully chased down 304 last week to win the opening Test at Durban by a single wicket.

India thump Namibia ahead of Pakistan clash
Italy crush Nepal in maiden T20 World Cup victory
Dubai Duty Free Tennis Championships reveals major expansion plan
Sri Lanka crush Oman for second victory in T20 World Cup
Philippine's rising star Alexandra Eala to debut at Dubai Tennis Open
