Kulasekara, who has been a spearhead in Sri Lanka's seam bowling attack, was injured during a tri-nation series in the Caribbean last month and missed a five-match one-day international series against South Africa at home.
The squad led by Dinesh Chandimal and fast bowler Lasith Malinga as his deputy has seven specialist batsmen, three all-rounders, three specialist fast bowlers and two spinners.
The first match of te series will be played in Colombo while the remaining matches will be played in Hambantota.
Squad: Dinesh Chandimal (captain), Lasith Malinga, Kusal Perera, Tillakaratne Dilshan, Kumar Sangakkara, Mahela Jayawardene, Angelo Mathews, Lahiru Thirimanne, Angelo Perera, Jeevan Mendis, Thisara Perera, Nuwan Kulasekara, Suranga Lakmal, Sachithra Senanayake, Ajantha Mendis.
Sri Lanka pacer Nuwan Kulasekara back from injury for South Africa T20s
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