With the development of synthetic aperture radar (SAR) technology, SAR images are being widely applied, such as in SAR image fusion and transformation detection, where image matching is a key procedure. In this paper, a practical and rapid subpixel matching method is proposed for spaceborne SAR images. The subpixel SAR-oriented features from an accelerated segment test (SAR-OFAST) detection operator is employed to improve the detection accuracy of keypoints. By determining the overlapping area of master–slave images, the search range of matching is reduced, and the strategy of block matching is adopted to save computing resources. To verify the accuracy and reliability of the proposed matching method, several groups of SAR images obtained with an identical observation orientation and diverse observation angles were tested using the proposed and other methods. Experimental results demonstrate that the proposed method has a higher speed than other methods with similar performance in other indicators, making it more suitable for scenarios requiring high efficiency.