This is just a quick note to point out that all the posts relating to becoming a ski instructor are equally applicable to snowboard instructing. The only reason I use the term ski instructing is that I personally am a skier and ski instructor. I have never taught snowboarding (and it is probably safer for novice snowboarders if it stays that way).
Snowboard instructor courses offered by BASI and other organisations follow a very similar format to the ski qualifications (and the S in the name changed from 'Ski' to 'Snowsport' some years ago).
The only exception to this is regarding the right to work in France. At present, only those skiers who have passed the Eurotest or Test Technique (or have gained an exemption through having 80 FIS points or lower) can work in France as snowsport instructors. These tests only apply to skiers and there are no snowboard equivalents. Until recently, France simply did not recognise any snowboard qualifications. However, following pressure from other nations a few Snowboard instructors have been allowed to work in France legally. The current situation is quite complicated and still changing, as for skiers, qualifying to work in France is difficult and likely to remain so.