I\'m updating my current app to use snackbars, in the Google spec they show various ways of using them http://www.google.com/design/spec/components/snackbars-toasts.html#sna
In addition to Saeid's answer, you can get the default SnackBar layout params and modify them as you want:
public static void displaySnackBarWithBottomMargin(Snackbar snackbar, int sideMargin, int marginBottom) {
final View snackBarView = snackbar.getView();
final CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) snackBarView.getLayoutParams();
params.setMargins(params.leftMargin + sideMargin,
params.topMargin,
params.rightMargin + sideMargin,
params.bottomMargin + marginBottom);
snackBarView.setLayoutParams(params);
snackbar.show();
}