<div id="spreadsheet"></div>
<script>
var spreadsheet = $("#spreadsheet").kendoSpreadsheet({
    sheets: [
        { name: "Sheet1" },
        { name: "TempSheet" },
        { name: "Sheet3" }
    ]
}).data("kendoSpreadsheet");

var tempSheet = spreadsheet.sheetByName("TempSheet");
spreadsheet.removeSheet(tempSheet);
console.log("TempSheet removed");
</script>