The representation and exploration of ontologies still present significant challenges, particularly intuitiveness and user interface accessibility. Most approaches are based on textual structures and two-dimensional visualizations that fail to adequately reflect human cognitive and perceptual mechanisms based on multisensory integration. Multisensory interfaces are designed to improve understanding of concept relationships, reduce cognitive load, and improve information retention. To address this limitation, we propose OMNI (Ontological Multisensory Navigation Interface), an innovative tool that facilitates ontology navigation through a multisensory interface integrating visual, auditory, and tactile stimuli. Since multisensory interaction is still unexplored, OMNI has been conceived as an End-User Development (EUD) tool, allowing non-expert users to customize the ontology exploration. The tool enables the association of multisensory stimuli to semantic attributes without requiring programming skills so that experts in the domain of knowledge represented by the ontology can quickly explore different options. This research represents a preliminary step in a more extensive study to identify the most effective sensory codings for ontology representation.