@Julie ***
I’d recommend searching online for job portals which specialize in remote work jobs, then find the ones which allow full remote, contact them to ask if they are ok with the employee working from Thailand then submit resumes to those who are.
A lot of the remote position listings will say something like “Remote US” or “Remote UK” but that could mean either you can work from anywhere but have to be legally allowed to work in that country (US or UK for example) or that you can work remote but only within that country.
Also keep in mind the work hours.
If they expect your husband to work US or even UK hours then that can be a big lifestyle hurdle.
If you want to keep somewhat normal Thai hours then you’d have to find a company willing to be flexible on the hours, which reduces the pool of available jobs even more.
If working at night is an issue then finding a job in Thailand might be worth the lower pay and other issues such as longer hours, probably having to live in Bangkok, language and cultural barriers, etc.