Yes
But First, There is a chance that you already have a shut off valve in the system.
If you know where your connection to the sprinkler water from the house water is, that is where to look.
Usually, a couple feet from the water meter or point of connection. It will be in a round valve box, usually grass will grow over the shut off valve. If you tap a shovel into the ground and listen for a thud or different sound than grass you may find it.
Or if you do not have one you can find the supply line to the Backflow preventer and install a ball valve.
Good Luck.