As an India national, you are eligible to apply for several types of Sri Lanka visas, based on the duration and purpose of your visit. Let's go over the different options.
ETA Sri Lanka eVisa (Single Entry)
Visa Validity: depends on Embassy / Immigration from the date of issue
Stay Validity: depends on Embassy / Immigration from the date of entry
Processing Time: 24-48 Working Hours
Visa Fee: USD 69.00
List of Required Documentation for ETA Sri Lanka Visa Application
Photograph: A clear front-facing photograph of the applicant.
Copy of India Passport. A clear copy of your valid India passport with at least 6 months remaining valid Indiaity.