mkdir ~/.config/blender/2.79/scripts/modules
pip install -t ~/.config/blender/2.79/scripts/modules <python-package>

def fix_path():
    """Enable 3rd party Python modules installed in an
    active Virtualenv when Python is run.
    (Blender ignores the virtualenv, and uses a
    Python binary hardcoded in the build. This works
    if the virtualenv's Python is the same as blenders')
    """

    import sys, os
    from pathlib import Path

    pyversion_path = f"python{sys.version_info.major}.{sys.version_info.minor}"

    for pathcomp in os.environ["PATH"].split(os.pathsep)[::-1]:
        p = Path(pathcomp)
        if p.name != "bin":
            continue
        lib_path = p.parent / "lib" / pyversion_path / "site-packages"
        if not lib_path.exists():
            continue
        if str(lib_path) in sys.path:
            continue
        sys.path.insert(0, str(lib_path))

        print(f"{__name__} Add-on: prepended {lib_path!r} to PYTHONPATH")

fix_path()