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Sensor-cloud systems (SCSs) aim to provide flexible configurable platforms for monitoring and controlling the IoT-enabled applications. By integrating sensors, wireless networks and cloud for managing sensors, collecting data, and automating decision-making, the collected sensing data are typically used for machine learning purposes. With increasing emphasis in privacy protection, Federated Learning (FL) is widely adopted for enhancing privacy preservation. FL enables sharing of data for machine learning while preserving the privacy of the data owners. In SCSs, FL involves a large number of edge nodes in order to ensure a sufficient amount of data for model training. However, FL inevitably incurs prohibitive overheads if it simply gathers data from all the nodes, hence making it desirable to adopt some scheduling strategy so that data are collected only from a selected subset of nodes. This paper proposes a …