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We report the fabrication of Pt@SnO2 nanoparticles using a sol–gel method. These nanoparticles are used as a sensing material. The structural and morphological characterization of the prepared Pt@SnO2 nanoparticles was performed using ultraviolet–visible spectroscopy, X‐ray diffraction, transmission electron microscopy, and energy‐dispersive X‐ray spectroscopy. The sensor responses of SnO2 and 1 wt% Pt/SnO2 to 1% hydrogen gas (H2) were 1.3 and 1.9, respectively. The sensor response of a Pt@SnO2 core–shell sensor increased to 5.1 at room temperature; it improved by 3.9 times compared to SnO2 and by 2.7 times compared to 1% Pt/SnO2 in sensing 1% H2. The response time for the prepared Pt@SnO2 sensor was also shortened by 2.0 and 1.4 times compared to SnO2 and 1 wt% Pt/SnO2, respectively. The sensor response increased rapidly from 1.4 to 5.1, with an increase in H2 concentration from 800 to 10,000 ppm (1%). We investigated the H2‐sensing mechanism of Pt@SnO2.