Separate Power for Grove Base Hat

I am using a Grove Base Hat on a Raspberry Pi 4B. I have a large amount of sensors connected.
Is it possible to power (3.3v) the Hat and sensors separately so as not to overload the RPI 3.3v?
I was thinking of clipping off the 3.3v pin on the GPIOs below, then connecting an additional supply through the GPIO pins above. Any ideas?

Thank you.