Wordpress - Is it possible to remove WYSIWYG for a certain Custom Post Type?

add_action('init', 'init_remove_support',100);
function init_remove_support(){
    $post_type = 'your post type';
    remove_post_type_support( $post_type, 'editor');
}

place it to your themes functions.php

You can actually disable the WYSIWYG editor, leaving only the html source editor. Choose a function below:

// disable wyswyg for custom post type, using the global $post
add_filter('user_can_richedit', function( $default ){
  global $post;
  if( $post->post_type === 'product')  return false;
  return $default;
});

// disable wyswyg for custom post type, using get_post_type() function
add_filter('user_can_richedit', function( $default ){
  if( get_post_type() === 'product')  return false;
  return $default;
});

Alternatively, you can handle post-editor support directly in your register_post_type() call, via the 'supports' parameter in the $args array.

The default value is: 'supports' => array( 'title', 'editor' ).

You can change it to whatever you need; for example: 'supports' => array( 'title' ).