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Yes. It's not really an application but a system setting or system applet. It's accessable from the HTC Home launcher. In fact it's on there by default.

To customize HTC Home.

Click the button on lower right (Circle with X), it will switch to a return arrow.

Then click on button you want to replace (that will clear it).

Then click the button on lower right again (now with return arrow).

Now that spot you cleared will have a grey circle with a + (plus) in it. Tap it (or tap and hold I forget).

Now browse for "Rotate Screen" 4th from the top in the list.

Choose Select at the bottom and your done.