Many of our documents can be executed in counterparts and this will often be included as a clause in the agreement.
This means that each party can sign a different copy of the document but both signature pages would be put together with one version of the contract. If the contract states that facsimile (faxed, scanned, or emailed) signatures are acceptable, then you could fax the contract and signatures to the other party.
Where there is no provision in the document authorizing facsimile signatures then you should contact an attorney in your jurisdiction to determine the laws affecting facsimile signatures and your specific document.