Can split brain surgery treat parkinson's?

No: Parkinson's is best treated with medications first and then if not improving, it can be treated using deep brain stimulation. As of today, there are no cures for Parkinson's and hence despite either therapy, most patient will slowly worsen with time.

Surgery Parkinsons: Surgical management for parkinsons disease may involve placement of a stimulator in the brain. It is used for medical refractory parkinsons. Seek guidance from a neurologist whether a referral to a neurosurgeon skilled in this procedure is indicated.