This study aims to present a case of Sinonasal glomangiopericytoma (SNGPC) in a 43-year-old woman, emphasizing the diagnostic challenges and highlighting the importance of considering rare tumors in the differential diagnosis of nasal polyps. We describe the clinical presentation, diagnostic process, and treatment outcomes of a patient presenting with chronic bilateral nasal obstruction, anosmia, and intermittent epistaxis. Initial diagnosis of benign nasal polyps was made based on endoscopic findings, followed by histopathological analysis confirming bilateral SNGPC. Our case underscores the diagnostic challenges posed by SNGPC, its resemblance to benign nasal polyps, and the importance of meticulous evaluation and histopathological examination for accurate diagnosis. The patient underwent appropriate management, with successful confirmation and treatment of bilateral SNGPC. This case highlights the critical role of considering rare tumors in the differential diagnosis of nasal polyps. Early detection through continuous monitoring is essential for detecting potential recurrence or complications associated with SNGPC.