Unfortunately, this is a poor
Unfortunately, this is a poor time to transplant sage. It's in bloom and the weather is warm. In general, sage can be a challenge to move because you can not easily dig up the plant; when you do, the soil falls off because the roots are woody. It's best to move the plant in small sections in early spring. Since your sage has spread too much, you could dig up part of it and discard it now, then wait until next spring and move new little plants that you may find or other small parts of the plant, which you can easily separate.