Have hauled our tandem all over this country in our Honda Accord Station Wagon. Mark's idea of a bike box on the floor works fine; we use a piece of old carpeting. Removing one wheel (front) should work with most wagons; if not, then remove both wheels, it will fit fine. We've even hauled a tandem in a VW Squareback!
You can also opt to leave the hatch of the wagon open and put tandem inside (back wheel goes in first, derailleur side up. Then put padding on the front wheel that will stick out a bit, haul down the hatch and secure it with bungee cord or an old innertube.
Go out and have fun 2-gether!!! . . .and don't forget to communicate when shifting braking, etc. with your sweetie!

Rudy and Kay/Zona tandem