Ohhhh jeeez… I have no idea why I suggested China! My daughter wants to move to Japan, I have a friend who moved to Thailand, another to Cambodia, and I have lived in S. Korea… so I have no excuse. My brain really fails me sometimes 
Okay, I totally get where you are coming from now…on track! Well, my friend in Cambodia does some contract work, hes in IT though and got most of his clients locally before moving over there. Most of the resources Ive collected that are somewhat similar are for remote positions for people traveling abroad. Thats not for freelance work though, but for companies hiring remotely. If you’re interested though, let me know and Ill go through what I have.
Freelancing though, yeah…strictly from online does tend to be rough, and my experiences have really mostly been with finding clients locally. On that vein though, if you ever do come across Americans in Thailand, give them your card! Actually, give them a bunch because they may know other people who they can pass your cards along to.