function my_wc_theme_wrapper_start() {
    echo '<div id="content"><div id="content-loja">';
}
add_action( 'woocommerce_before_main_content', 'my_wc_theme_wrapper_start', 10 );

function my_wc_theme_wrapper_end() {
    echo '</div></div>';
}
add_action( 'woocommerce_after_main_content', 'my_wc_theme_wrapper_end', 10 );