Hi Shilpi,
If you are using sap.ui.table.Table, then use clearSelection() method.
API: JsDoc Report - SAP UI development Toolkit for HTML5 - API Reference - sap.ui.table.Table
If you're using sap.m.Table, then use removeSelections() method.
API: JsDoc Report - SAP UI development Toolkit for HTML5 - API Reference - sap.m.ListBase
Regards,
Sai Vellanki.