Can I apply for a Thai marriage visa if married to a Thai citizen outside Thailand?

Jumped through all these hoops myself.. non Thai marriage certificate has to be translated into Thai and stamped by MFA in Thailand.. but original also has to be stamped by embassy of country of marriage.. we used an agent in CM to handle it all.. so as to avoid having to fly down to Bankgkok ourselves.. they included a translated copy of my passport in case of need as well.. and was well worth the cost given the saving on flights etc.. one of the few occasions that agents really make sense imo.. process took around 2-3 weeks.. once documents are to hand marriage needs to be registered at your local Amphur and certificate of registration obtained.. I'd suggest you get 3-4 original stamped copies.. you need this to apply for a 'non-o' visa based on marriage.. you also need it to apply for a yellow book and a pink ID card later.. be aware some Amphurs try to retain your original stamped certificate of translation.. i told mine they could have it if they reimbursed me for the cost of it.. and they eventually backed down and took a copy they certified for themselves.. but it took some serious haggling to achieve that! Clearly different provinces and different amphurs have their own 'rules' but that's the gist of it.. good luck!