If you plan to extend your stay in Sri Lanka, then an extension to your visa should be applied. Approval of extension is subject to immigration authority depending upon the reason for the extension, and whether the Department of Immigration and Emigration is convinced that the applicant should return to back home country after the stay in Sri Lanka.
If you looking for an extension of your tourist visa. The maximum stays for extension you can request up to 6 months. Other type of visa is extendable depending on the reason you provided to High Commission of Sri Lanka.
We strongly advice applicants to apply visa extension well before expiry date to avoid penalties and inconvenience. Extending stays within your visa is breaches of ETA policy that may lead to rejection of the extension, detention and deportation from Sri Lanka.
Visa extensions application can be submit through Immigration Service Center located in Colombo at the Department of Immigration and Emigration in Battaramulla.
An ETA holder requesting for an extension of their ETA should apply for extensions before the expiry period of the ETA. ETA extension can provide up to 3 months usually and then maximum length of tourist visa is for six months.
For more details visit immigration portal for further information.