You need an ETA for Sri Lanka if you have an Indian passport
Visa options for Sri Lanka (2)
Electronic travel authorization
Travelers need a travel authorization to visit Sri Lanka for Tourism or Business. Visa-exempt visitors entering Sri Lanka must obtain an Electronic Travel Authorization (eTA). Travelers can submit the eTA application online. Once the application is approved, travelers receive their eTA confirmation electronically. An eTA is electronically linked to a passport and valid for up to 30 days. If travelers receive a new passport, they must apply for a new eTA.
This is not offered by sherpa°.
Apply on the government site.
Visa on arrival for a maximum of 30 days
Travelers need a visa to visit Sri Lanka for Business or Tourism. Travelers can get a visa on arrival in Sri Lanka at the port of entry of Bandaranaike International Airport.
This is not offered by sherpa°.
Apply on the government site.