Interstitial brachytherapy is a primary treatment modality for cervical cancer, involving the insertion of radioactive sources, such as needles, into or near tumor tissues. The proper choice of needle number and precise placement of these needles are critical to optimize the dose distribution, the treatment effectiveness, and the protection of healthy tissues. However, due to patient-specific variations in anatomy, a high level of training experience and expertise are required to navigate needles. Therefore, this study aims to develop a virtual reality (VR) training system for interstitial brachytherapy, enabling practitioners to place needles within virtual tissues and automatically evaluate their alignment with the real-world reference needle positions.