The aim of this study is to investigate the effect of sensory- motor training on hand and upper extremity sensory and motor function in patients with Parkinson's disease. In this clinical trial study, 40 patients with idiopathic Parkinson's disease are randomly assigned to two groups: group receiving sensory-motor training and control group. The main inclusion criteria include having Parkinson's disease according to neurologist diagnosis, the disease progression level of 1 to 3 according to Hoehn and Yahr Scale, an acceptable level of cognitive function, i.e. score of more than 21 on the Mini Mental Status Examination (MMSE) and being eligible for sensory-motor retraining (having the light touch sensation at the level of acceptable mono-filaments, i.e. 4.31 and above in the fingertips and no severe problems of proprioception and discrimination sensation). In case of no cooperation during training and exercises and not returing for testing after the interventions, subjects are excluded. Sensory- motor training group receives 10 sessions of sensory-motor training (5 sessions per week, 3 to 5 hours per session). Control group does not receive any sensory-motor training. Both groups are evaluated in terms of sensory and motor functions of hand and upper extremity before and after 2 weeks.