For many years cardiac diseases continue to be a significant global health concern, necessitating innovative approaches to early detection and continuous monitoring. Currently cardiac devices are formed in bulky and rigid form, which consists of battery, electrode, and circuits, causing many limitations for long-term use. Soft bio-implantable sensor technology has emerged as a promising solution, offering unique capabilities to revolutionize cardiac disease detection and management. To detect and early treatment of the cardiac disease, electric sensor and pace-maker could be integrated in cardiac devices. All these components, constructed from biocompatible materials and designed to conform to biological tissues, offer a paradigm shift in cardiovascular healthcare. Data collected by these sensors can be wirelessly transmitted to external devices or cloud-based platforms, enabling remote monitoring by healthcare professionals. Their soft, biocompatible nature reduces the risk of adverse tissue reactions, making them suitable for long-term implantation. In this review we address the importance of biocompatible soft cardiac sensor technology. Moreover, we focused on what kinds of sensors could be integrated in future soft cardiac disease detection system.