This assumes you have installed both Eclipse and SBT.
Install the SBT plugin for Eclipse from the Eclipse marketplace.
In the command line switch directory to the root directory of the project.
$ cd ~/home/sample/project
Execute sbt, which will load the project.
$ sbt
Compile the project to ensure dependencies are obtainable.
> compile
Run the eclipse
task:
> eclipse
Go into Eclipse and select the menu option:
File > New > Project From Existing Sources
In the wizard, navigate to your project directory and select it. Eclipse will handle the rest.