POWER OF ATTORNEY

For Executing Forms 3, 4 and 5

The undersigned
hereby constitutes and appoints each of Jane Owens, Esq., Shawn Hoyt, Esq.
and Keith Higgins, Esq. as his or her true and lawful attorneys-in-fact to:


1.	execute for and on behalf of the undersigned Forms 3, 4 and 5
relating to changes in the undersigned's beneficial ownership of securities
of Sapient Corporation and any necessary amendments to such forms, in
accordance with Section 16(a) of the Securities Exchange Act of 1934 (as
amended, the "1934 Act") and the rules thereunder, and

2.	do and
perform any and all acts for and on behalf of the undersigned which may be
necessary or desirable to complete the execution of any such Forms 3, 4 or
5 and the timely filing of such forms with the Securities and Exchange
Commission and any other governmental authority.

The undersigned
hereby grants to such attorneys-in-fact full power and authority to do and
perform every act necessary and proper in the exercise of any of the rights
and powers herein granted, as fully as such attorneys-in-fact could do if
personally present, with full power of substitution or revocation, hereby
ratifying and confirming all that such attorneys-in-fact shall lawfully do
or cause to be done by virtue of this Power of Attorney and the rights and
powers herein granted.  The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming any of the undersigned's liabilities under
Section 16 of the 1934 Act.

This Power of Attorney shall replace any
previous Powers of Attorney signed by the undersigned with respect to the
matters covered above and shall remain in effect for so long as the
undersigned is required to file reports under Section 16(a) of the 1934 Act
with respect to securities of Sapient Corporation.

IN WITNESS WHEREOF,
the undersigned has caused this Power of Attorney to be executed as of this
13th day of September, 2004.

/s/ Jeffrey M. Cunningham
Jeffrey M.
Cunningham