Did you find any project to work on yet?
Yes, it is possible to work 100% remote as a tester. Still, depending on the project, you may need an environment setup, some settings are done on your machine, some dialog with project members. The environment settings and installation can be done easier face to face, and somehow harder remotely. A few days of face to face meeting are very helpful and sometimes necessary, depending on the project and teams involved in the project.
You need to get in touch with many recruiters, I would say that is vital because working remotely is more of a freelancer work rather than permanently employed work. You may offer services for few hours, days, or months to specific companies, or even to other freelancers who need help. As a freelancer, you need "spam" mail with new projects, because, once you finish working on a project, you need to find another one. It is better to passively receive advertise rather than searching specifically, if you have the right recruiters who advertise on your area of activity. Later when you have experience, and build a good profile, you may even become employed and work remotely.
If you rely on starting by using freelancer websites, where you start workingplace cheap bids on existing projects, in order to build a profile, (that will work indeed), you will have a very slow start, but, it is a start, it will work.