The laws governing the legal use, storage and carrying of firearms are constantly changing. Below are the applicable laws in the State of Indiana as of 3/06/2013. The below information is designed to be a guide and not the final word. If you have specific questions, please refer to the Indiana State legislation at in.gov. Another great resource is a Firearm FAQ, provided by the Government of Indiana.

IC 35-47-2-3. Application for license to carry handgun; procedure
Sec. 3. (a) subsection 3. A person desiring a license to carry a handgun shall apply:  if the applicant is a resident of another state and has a regular place of business or employment in Indiana, to the sheriff of the county in which the applicant has a regular place of business or employment.

IC 35-47-2-4Qualified or unlimited licenses to carry handguns; fees; exemptions from payment of fees
(f) The superintendent may not issue a lifetime qualified license or a lifetime unlimited license to a person who is a resident of another state. The superintendent may issue a four (4) year qualified license or a four (4) year unlimited license to a person who is a resident of another state and who has a regular place of business or employment in Indiana as described in section 3(a)(3) of this chapter.

NOTE: The application procedure for a non-resident is the same as the resident Procedure.  Contact the sheriff department of the county your business resides in for further information, you will need to provide evidence of the location of your business.