Piezo modal sensors/actuators are devices that utilize the piezoelectric effect to measure/excite a particular mode while remaining insensitive to the non-targeted modes. The design of such transducers is typically confined to determining the location of tailor-made electrodes of opposite polarity, meaning one seeks to determine which electrode areas have positive polarity (+1) and which areas are negative (-1). Surprisingly, these electrode profiles can be obtained as the solutions of a linear programming problem that elegantly models the design problem. Designs resulting from this process, however, typically exhibit isolated features of like-polarity, and this characteristic typically becomes more pronounced as additional modes are considered. These isolated features pose significant challenges from a manufacturing and operation point of view, as each feature must be connected to a current source, thereby resulting in complex or cumbersome wiring schemes. This work introduces a connectivity constraint on the electrode profiles to dramatically simplify electrode phase connectivity and therefore the required wiring schemes. The resulting design problem is solved using density-based topology optimization methods and numerical examples confirm that piezo modal transducers can be designed with simply-connected electrode phases, thereby providing efficient performance together with improved manufacturability.