My parents travelled from Chennai (2nd may) to Colombo and returned on May 4th, since they have completed 2 dose of vaccination + 2 weeks wait period after dose. They can travel to Srilanka, but required to quarantine at level 1 hotels to get onarrival pcr test results. Once negative they have to leave level 1 hotels and good to stay anywhere and perform their biometrics. ETA has to be applied, one thought is visa will be approved once you book the level 1 hotel. The checkpoint here is to complete the vaccination.