Yes, but a second cable modem will need a second internet subscription.
MoCA adapters can work, depending on what other services you have and the wiring in your home.
Try PowerLine networking too.. The current generation of Gigabit adapters are pretty good, depending again on the wiring in your home.
MoCA and PowerLine would save you paying for another internet account.
The ideal way would be to run an Ethernet cable into your room though.