Change the add-to-cat button URL

functions.php

/* 
* How to add the custome code. 
* 
* Please follow below instructions:
* 1. Copy the below code.
* 2. Open your child theme's functions.php file.
* 3. Paste the copied code at the very bottom of it & save the file OR upload it on your server/hosting.
*/

/* Change the add-to-cat button URL */
add_filter( 'woocommerce_add_to_cart_form_action', 'pp_change_butn_url' );

function pp_change_butn_url( $url ){
	global $post;

	if( your_product_id === $post->ID ){

		$url =  "add_your_landing_page_url";
	}

	return $url;
}
/* Change the add-to-cat button URL */