Below you can find a document on (some) of the conditions for internships abroad, these conditions vary whether you are a Flemish or Wallonian student. Keep in mind that there is a lot more administrative workload to it compared to what is pointed out in these documents. Make sure you have a certificate of proficiency for the relevant language. This workgroup is led by Anne-Sophie Vanhoenacker.
Dutch - document for Flemish students:
Niet-erkende stage in het buitenland
French - document for Wallonian students:
Stages à l'étranger