I dunno of any other way to get into the field than through military Explosive Ordnance Demolition (EOD)trainin'. The field is among what are known as Special Operations (SO or SpecOps), exclusively the purview of elite, career-oriented, highly trained personnel. EOD specialists typically will be members of Ranger, SEAL, Special Forces, or Scout-Sniper units - truly the cream of the combat crop. As with any elite units, there are far more candidates for the training than there are positions for graduates of the programs, but the nature of the training whittles the field down to the select few who have what it takes. There are always openings, but getting all the way there is a real challenge. The civilian market for experienced EOD personnel is both lucrative and highly competitive - there aren't a lot of 'em to go around.
If you're really interested, here are a couple options:
US NAVY EOD
US Army EOD
What the heck - give a try - you might get a real bang out of it. Be careful, though .... you don't want it blowin' up in your face.