Can I get a multiple entry visa for my exchange program in Thailand?

Nicola Padus I think you're confused how the process works to be an 'exchange student'.

Education visas are only sold as single entry 90 day visas at ALL thai consulates, there is no multi-entry ED visa available any more

The process works like this;

You get the 90 day single entry ED visa from a thai consulate, THEN once you're here and the 90 days runs down you get documentation from the university and get an extension on that 90 days.

If it's a real uni degreed course you'd get a year extension, otherwise they issue 90 day extensions.

IF you get the year extension then you would by a multiple re-entry permit and that would let you exit/re-enter the country all you wanted during that year

However, if you get just a 90 day extension you would still need a re-entry permit if you were going to exit/re-enter thailand

BUT

you'd need a NEW re-entry permit every time you got another 90 day extension (the re-entry permit is only valid as long as the extension)