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The provisioning of immersive point cloud video (PCV) streaming on pervasive mobile devices is a cornerstone for enabling immersive communication and interactions in the future 6G metaverse era. However, most streaming techniques are dedicated to efficient PCV compression and codec extending from traditional 3-DoF video services. Some emerging AI-enabled approaches are still in their infancy phase and are constrained by intensive computational and adaptive flow techniques. In this paper, we present ISCom, an Interest-aware Semantic Communication Scheme for PCV, consisting of a region-of-interest (ROI) selection module, a lightweight PCV streaming module, and an intelligent scheduler. First, we propose a two-stage efficient ROI selection method for providing interest-aware PCV streaming, which significantly reduces the data volume. Second, we design a lightweight PCV encoder-decoder network for resource-constrained devices, adapting to the heterogeneous computing capabilities of terminals. Third, we train a deep reinforcement learning (DRL)-based scheduler to adapt an optimal encoder-decoder network for various devices, considering the dynamic network environments and computing capabilities of different devices. Extensive experiments show that ISCom outperforms baselines on mobile devices at least 10 FPS and up to 22 FPS.