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Skipper Misbah-ul-Haq (72 not out) and Umar Akmal (77) hit half-centuries as Pakistan achieved a 189-run target with more than 10 overs to spare in the day-night match.
Kumar Sangakkara (71) and Upul Tharanga (57) were Sri Lanka's main scorers, while paceman Aizaz Cheema took four wickets and off-spinner Saeed Ajmal bagged three for Pakistan.
Brief scores:
Sri Lanka 188 in 45.4 overs; Pakistan 189-4 in 39.5 overs