Here are major banks in Sri Lanka that offer online (internet + mobile) banking services. Almost all commercial banks in the country provide online banking — below are representative banks with their official online-banking pages.

• Commercial Bank of Ceylon — ComBank Digital (web & mobile). (combank.lk)
• Hatton National Bank (HNB) — Internet / mobile banking and self-onboarding. (hnb.net)
• Bank of Ceylon (BOC) — Smart Online Banking (web + mobile). (boc.lk)
• Seylan Bank — Seylan Internet / mobile banking with soft-token and self-registration. (seylan.lk)
• Amãna Bank — Internet & mobile banking with self-registration. (amanabank.lk)

Other banks in Sri Lanka that offer online/mobile banking (each has its own web or app platform):

• Sampath Bank
• People’s Bank
• Nations Trust Bank
• National Development Bank (NDB)
• DFCC Bank
• Pan Asia Bank
• Union Bank
• Commercial & retail branches of many other licensed banks and specialized banks

If you want, I can:

• Provide direct links to the online-banking / registration pages for a specific bank (I can fetch the latest page for any bank you name).
• List the exact services offered by any one bank’s online platform (fund transfers, bill pay, LankaPay features, e-statements, soft-token, etc.).