Three-flavor neutrino oscillations have successfully explained a wide range of neutrino oscillation experiment results. However, anomalous results, such as the electronantineutrino appearance excess seen by LSND and MiniBooNE, do not fit the three-flavor paradigm and can be explained by the addition of a sterile neutrino at a larger mass scale than the existing three flavor mass states. This paper will present a novel method for selecting tau-neutrino interactions with high purity at the NOvA

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... ar Detector using a convolutional neural network. Based on this method, the sensitivity to anomalous short-baseline tau-neutrino appearance due to sterile neutrino oscillations will be shown.