SCP1000 + SD Card

I'm trying to use a SCP1000 pressure sensor (from Sparkfun) and a data logger shield (from Adafruit). They both use SPI communication, but the chip select on the SCP1000 doesn't work properly. So, once I write to the SD card the SCP1000 crashes and requires a hard reset (turning off power).

So, is there a way to turn off the power to the SCP1000 through the Arduino software? It uses 3.3v, so I can't just turn on and off a digital pin. Would a transistor work? (5v digital pin to base, 3.3v to collector, then emitter to pressure sensor) Can you even use a transistor to switch lower voltages?

Thanks!

It uses 3.3v, so I can't just turn on and off a digital pin.

Why not? If the digital pin goes to one end of a voltage divider, with the other end to ground, and the sensor connected to the center point, you could turn on and off the device as needed.