Where can I find online research projects that I can work on? I am interested in doing some research online in theoretical physics, quantum mechanics or computational physics.

Is there a way that I can work with an advisor or in a group online? I don't mind doing it for free, or even I can pay to work on such research projects.

I have a bachelor's degree in Physics and currently pursuing a masters in Mathematics.  While studying Math, I found myself missing physics so that's why I am looking for physics research projects to work on.
If you have any ideas about reducing morbidity and mortality from traumatic injury and sudden cardiac arrest, you're welcome to join my working group. Seriously. We're intersectoral - everyone is welcome.

Alternatively, start a blog/website and leverage social media to bring collaborators to you. This methods has really worked for my group.