Tinnitus is a highly prevalent and distressing symptom in patients with idiopathic sudden sensorineural hearing loss (ISSNHL). While international clinical guidelines primarily focus on hearing recovery through pharmacological interventions, effective treatment for tinnitus remains limited. Sound therapy, such as masking and retraining therapy, has emerged as a promising treatment. This systematic review aims to evaluate the efficacy and safety of sound therapy for the alleviation of tinnitus in adult patients with ISSNHL.