(Sec. 3) Directs the Small Business Administration (SBA) to: (1) perform an annual examination of the programs and finances of each women's business center; and (2) determine the viability of each center after such examination. Requires a report from the SBA to the congressional small business committees on the effectiveness of all projects conducted under the women's business centers program.

(Sec. 4) Establishes a four-year pilot program under which the SBA is authorized to make grants on a competitive basis to organizations that have received assistance for participation in the women's business centers program and that: (1) are in the final year of a five-year project; or (2) have completed a financed project and continue to provide assistance to women entrepreneurs. Outlines grant participation conditions, including certification that the organization is private and nonprofit and submission of a five-year plan that demonstrates the organization's ability to serve women business owners or potential owners and to provide training and services to women who are both socially and economically disadvantaged. Outlines matching fund requirements and application procedures. Authorizes appropriations for FY 2000 through 2003 for the pilot program, earmarking specified amounts for administrative costs related to the selection of grant participants and sustainability grants.

(Sec. 3) Directs the Small Business Administration (SBA) to: (1) perform an annual examination of the programs and finances of each women's business center; and (2) determine the viability of each center after such examination. Requires a report from the SBA to the congressional small business committees on the effectiveness of all projects conducted under the women's business centers program.

(Sec. 4) Establishes a four-year pilot program under which the SBA is authorized to make grants on a competitive basis to organizations that have received assistance for participation in the women's business centers program and that: (1) are in the final year of a five-year project; or (2) have completed a financed project and continue to provide assistance to women entrepreneurs. Outlines grant participation conditions, including certification that the organization is private and nonprofit and submission of a five-year plan that demonstrates the organization's ability to serve women business owners or potential owners and to provide training and services to women who are both socially and economically disadvantaged. Outlines matching fund requirements and application procedures. Authorizes appropriations for FY 2000 through 2003 for the pilot program, earmarking specified amounts for administrative costs related to the selection of grant participants and sustainability grants.

Women's Business Centers Sustainability Act of 1999 - Amends the Small Business Act, with respect to the women's business center program, to allow a private organization that has received financial assistance under the program and that is either in the final year of a five-year project or has completed the project to apply for assistance for an additional five-year period. Requires such organizations to agree to obtain matching cash contributions from non-Federal sources.

Extends through FY 2001 the authorization for the program, allowing no more than 40 percent of such amounts to be used for providing such additional assistance.