First, depositing fund to paypal account is, as far as I know, only for US bank accounts. I might be wrong on this. For other countries, you need to have either debit card or credit card which you can use online. If you are using debit card issued by a Thai bank, it cannot be used online even though it says master or visa card. You need a credit card. However, if you are a non-Thai, it is difficult to get a credit card in one.

Don’t lose hope yet. There is another way that you can get a credit card. It is not a real card but can be used like a credit card. If you open an account with Kasikorn Thai Bank, you can ask to open an e-account. In other words, you can get e-account with your bank account. In addition, you can also get a virtual credit card (debit card actually), to use online. You have to put fund into your K Virtual credit card first from your account, and you can use up to that limit. This also prevents your money from being stolen by some online criminals as they cannot get more than you put in your card. Please ask at any Kasikorn Bank branch for details.

Hope this will solve your problem.