Negative refractive index (NRI) metamaterials have attracted considerable interest due to their ability to support unconventional electromagnetic phenomena. However, conventional designs are often limited by narrow operating bandwidths, the presence of parasitic positive refractive index (PRI) transmission peaks, and the lack of post-fabrication reconfigurability. In this work, we propose a vanadium dioxide (VO2) integrated dual-layer metallic dishnet metamaterial operating within the IEEE 802.15.3d standard band (252–321 GHz). The design leverages second order plasmon hybridization to overcome the above limitations and enable dynamic control of the electromagnetic response. By exploiting the differential sensitivity of hybridization modes to the thermally driven insulator-to-metal transition (IMT) of VO2, the proposed structure achieves two key functionalities. First, it enables complete suppression of the parasitic PRI transmission peak at 0.3418 THz, resulting in high-selectivity NRI transmission. Second, it allows controlled switching from a multi-peak NRI spectrum, supported by second-order plasmon hybridization, to a single-peak NRI operation, without structural reconfiguration. These results establish a design framework for dynamically reconfigurable and spectrally selective NRI metamaterials, with potential applications in 5G/6G communication filters and reconfigurable terahertz routing systems.