One option-- buy a pin header with extra long pins. Easy access to GPIOs! As I mentioned above, though, if you want to use the Sense Hat for reading the temperature, the Pi itself can interfere when your Hat is too close to the Pi board. If you don't need any of the other GPIO pins, it is also easy enough to use a GPIO cable extender to connect your Sense Hat without attaching it directly onto the Pi itself.
But, if you want to attach additional outputs to your Raspberry Pi, using all 40 pins for the Sense Hat can be a bit of an inconvenience. The good news is, the Sense Hat really only needs 11 of the pins in order to work-- the trick is knowing which ones!
As I started Googling around, a number of people recommended just using the Sense Hat schematics to figure it all out. If you are an electronics novice, though, like I am, the schematics can be tricky to navigate. Pinout.xyz is a helpful site and got me close, but unfortunately, the Pinout site did not include 2 crucial pins in their diagram (I think assuming those with more experience would already know to include those). Luckily, I found some help from the Raspberry Pi community on the official website discussion forum. From there, I created my own diagram to help me remember which specific pins I needed in order to use my Sense Hat without using up all 40 GPIO pins.
That diagram is below for your use!
(It does not matter which 3.3V, 5V or ground pins you use just as long as you include those.)