There are a number of scholarships available to the master students. Most of the options can be found through UPF's web page on Scholarships for Masters.
Apart from the scholarships, the various labs of the MTG and the collaborating companies offer internships to get involved in specific R&D projects. Information about them is given once the course has started and you can find information on the internships page.
The UPF offers a tuition fee waiver of 2.000 € for a student enrolled in the SMC master. More information in here.