In most cases, adding excessive flour to your cookie dough will make it dry. So with that, it would be best to measure your flour correctly to avoid a dry sugar cookie dough.
Bear in mind that overmixing your dough can result in a tougher dough because the gluten in your flour can overdevelop, resulting in a hard and dry dough.
Sugar cookie dough can dry out inside your refrigerator. A fridge is a drying place for your sugar cookie dough because air constantly circulates to keep your refrigerator cold.
Remember, making homemade sugar cookies is the best. However, people who bake and make cookie dough at home agree that cookie dough becomes dry; hence cookies will not turn out great.Find out more tips and tricks in the link below.