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As wireless sensor network platforms become increasingly more complex to designandoptimizeduetothemultitudeofinterdependentparametersthatmustbeconsidered, computer simulations have emerged as the primary solution to feasibly analyze the longterm effects of design changes within a deployed system. Although several successful wireless sensor network simulators have already been developed, to our knowledge, none provide the modularity necessary to model sensor nodes and/or environmental components at differing levels of abstraction. In this paper, we present the Arizona Transaction-Level Simulator for Sensor Networks (ATLeS-SN), which by virtue of its implementation language— SystemC—allowsapplicationdeveloperstoeasilyspecifyinterchangeablecomponentmodels in order to achieve the desired simulation correctness, performance, and scalability. We provide an overview of our proposed simulation framework and highlight its benefits using a sound ranging application.