Historically, SDK Manager.exe was a standalone executable located at the root of your Android SDK folder. Today, it is no longer provided as a separate download. You have two main ways to get it:
This guide explains how to locate, download, and configure the SDK Manager for use with your Eclipse IDE. download sdk manager.exe for eclipse
Once you have downloaded the SDK tools, follow these steps to prepare them for Eclipse: How to Setup Eclipse for Android App Development : 13 Steps Historically, SDK Manager