You can indeed have various (named) models, all of which can be available to your view(s), and depending on your need, have the proper model bound to one ore more of your view elements.
If you do need to refer to UI elements -- but again, I strongly advise against it -- you can do so by using for instance:
var oTable = sap.ui.getCore().byId("yourTableId"); //returns instance of your table, or null is no table found