By customizing the code of the view. Assign a group to that field so only the users in your group can see it.

<field name="standard_price" attrs="{'readonly':[('cost_method','=','average')]}" groups="your_group_id"/>

Or if you prefer buy this app.

https://www.odoo.com/apps/modules/8.0/dusal_product/ 

Hi,

Please refer to the following link:

 https://apps.odoo.com/apps/modules/10.0/hide_cost_price

You can find all the latest versions from v10 to v18.

Hope it helps