Maybe you can add an additional property to your model say "show" and set it according to your requirement and bind it this way.
new sap.ui.table.Column({
label: "Vacant",
icon: "sap-icon://list",
template: new sap.ui.commons.CheckBox("oCheckBox1", {
editable: false ,
visible : "{show}"
}).bindProperty("checked", "Vacancy"),
sortProperty: "Vacancy",
filterProperty: "Vacancy",
width: "100px"
}),