Change insurance

Hey people, my current insurance doesn’t allow me to cancel before 30.11. Is it possible to simply deregister the vehicle and to allow it again with another insurance company after a certain time!? If so, how long do I have to wait until I can allow the vehicle? I heard from a colleague that it would have to work. But would like to ask me in advance, not that I have the quarrel with two insurance companies. In advance, thank you for your help.