Search for "EASA CAT B" or "EASA Part 66" Course offered by EASA Part 147 approved organisations.
BTW: did you read the course brochure in your linked course?
...After you successfully complete the course, you must work for two to five years in an approved aircraft maintenance organisation (EASA Part 145) before full signatory powers can be awarded by EASA. The period of time is dependent upon you meeting all EASA Part 66 requirements, while studying on this approved EASA Part 147 Part 66 course. ...