Can I close my bank account online from abroad?

Yes, you can close your bank account online if you already moved abroad. You just have to contact your bank and enroll for online banking service. If you have remaining funds, you may send them a written mail by enclosing all the required documents (if any). There's a chance that you may receive a cheque from the bank.
Hope that helps.

If you have online banking facility, you can close bank account online. I would suggest you to talk to the bank and get the details about the matter.

Whatever option you choose, it's better that you at least call the bank and discuss it before taking necessary steps. It's even better to discuss about the procedure before you move out of your country.