Taking English courses:
It is possible to enroll in long-term English courses and obtain a student visa that will allow you to work outside of language courses (maximum duration of 24 hours/week in Australia and 20 hours in New Zealand and Canada).
You can choose between intensive courses or part-time courses, business English courses, English test preparation courses (IELTS, etc.).
Many language schools offer programs tailored to the needs of Working Holiday Visa holders. Visavacancestravail.be can advise you on this. Many schools are listed on this website.
To pursue professional training
Several countries, including Australia and Canada, offer professional training programs lasting one semester or one year with relatively few class hours, giving you the opportunity to work on the side. These programs are generally offered in the following fields: Digital Marketing, Business, Tourism, Project Management, Innovation and Entrepreneurship, Communication, etc.