Have you let the snake have any time to settle in and learn to feel secure in its new home? If not, try leaving it completely alone for a week or two, except to feed, water, and clean if necessary. Keep handling to a minimum.
When you do handle the snake, keep sessions short until it seems to feel more comfortable with the idea. Don't mess with its head. Don't let your hand or fingers hover around in front of its face. (Or any body part, if you can help it.) Don't hesitate when you do go to pick it up...just reach in and gently scoop it up. A hovering, hesitating hand is very frightening to a young ball python...or perhaps enticing to an older one.
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