SqlPackage.exe is not part of the SQL Server installation. It comes under SQL Server Data Tools team. You can download the Sqlpackage.exe using below link
SQLPackage.exe Download
Below is a excerpt from SQL Server Data Tools team blog
SqlPackage.exe is a command line tool that gives many of the same
features used in SSDT (to publish, extract, import and export
databases). If you want to take advantage of the latest features such
as Azure Key Vault support for Always Encrypted in SqlPackage, we
recommend you install the DacFramework.msi which includes all the
Azure DLLs needed to connect and publish to Azure SQL DB.
- SSDT will continue to install SqlPackage.exe in "C:\Program Files
(x86)\Microsoft Visual Studio
14.0\Common7\IDE\Extensions\Microsoft\SQLDB\DAC\130" so that users running on build agents won't have scripts broken, but this will not
have Azure support at present.
- SSMS now has its own copy of DacFx, so
updates to DacFramework.msi will not affect SSMS (and vice versa).
- DacFramework.msi installs to "C:\Program Files (x86)\Microsoft SQL
Server\130\DAC\bin\SqlPackage.exe" and updates independently of SSDT /
SSMS.
- We will work to get an easier installation for future updates so
you do not need an MSI to install SqlPackage.exe