Sensor observation service (SOS) is one of the core services of the sensor web enablement (SWE), which is used to manage the data of multi source sensor observation, and to provide data services to end users. Open geospatial consortium (OGC) developed a standard for inserting observation data into SOS and obtaining data from SOS, but could not handle the heterogeneous sensors using different access mode and different data transmission protocol adaptively. When manage the data of multisource sensor by SOS, system must resolve the observation data from sensor, and convert it to the data format under SOS specification. In this paper, we design a new technology scheme of data access to SOS for heterogeneous sensor, discussed the implementation process of the scheme from the aspects of sensor registration, access network selection, data receiving and parsing, insert document generation and data insertion. Take wearable heart rate monitoring sensor as an example, we realized the SOS management of heart rate monitoring sensor monitoring data. The result shows that the scheme is feasible, and it provides a basis for the access to SOS of heterogeneous sensors.