We planned to - it didn't work out.
We were on the verge of resigning (dh) and announcing a move to Latin America in order to work in a development role (I'm a teacher, with SN, basic skills and TESOL experience - dh is a GP with lots of lone working, remote/rural experience). We'd visited a project, been interviewed and accepted, started looking for funding for initial 2 years.
Then one day I was wobbly on my feet. After a few days was stumbling - then fell on the way to the loo. Multiple number of tests later I was diagnosed with a very rare neurological illness for which there is only one treatment, a monthly immunoglobulin drip that cost the nhs £8000 a go. After that, moving abroad was impossible, as it's a lifelong disability. We can't ask any charity/voluntary org to pay that, we certainly can't afford it, and any insurance company would laugh in our face!!
Instead, we've sought (and got) work in deprived areas at home. Voluntarily moved to one of the most impoverished urban areas in Scotland (we were already in Glasgow) - I teach basic literacy/numeracy/storytelling skills mainly to young mums who left school with no quals, dh commutes to the most deprived rural area in Scotland where he's a GP.
Depending on how you look at it, sometimes a virtual "overseas" is just around the corner (sorry, that sounds really "worthy", I don't mean it that way!!)