India and Pakistan have played 3 ODIs against each other in Sri Lanka. Back in June 2010, India beat their arch-rivals by 3 wickets in Dambulla. 

Back in 2004, Pakistan beat India by 59 runs at the R Premadasa Stadium in Colombo. 

Their match back in 1997 at the SSC in Colombo did not produce results due to rain. 

2 of their matches were abandoned without a ball being bowled.