Depends what qualifies as suitable. With enough engineering you could establish a colony practically anywhere with access to energy and matter. More near term,

Depends what qualifies as suitable. With enough engineering you could establish a colony practically anywhere with access to energy and matter. More near term, you could build self contained environments on or below the surface of planets and moons or in orbit. Longer term (slightly?), you could modify your biology to thrive in harsher conditions. Even further out, just bring your "planet" with you it would be a true wanderer then.